After his goal-scoring bow, Powell admitted he was 'scared' stepping onto the Old Trafford pitch.
"When I first came out onto the pitch, the crowd scared me a little bit," he said.
"I am only used to 5,000 people every now and then.
"It is a great feeling but I will keep myself on the ground."
Powell did admit he is learning a great deal from training alongside Paul Scholes.
"It is unbelievable. He has so much experience," he said.
"He came off when I came on but it was great to be on the pitch with the lot of them, especially Scholes making his 700th appearance for United."